Rashi on Genesis 24:60/רש"י על בראשית כ״ד:ס׳

1את היי לאלפי רבבה MAYEST THOU BECOME THOUSANDS OF MYRIADS —May you and your seed receive that blessing which was promised to Abraham on Mount Moriah, (Genesis 22:17) “I will greatly multiply thy seed … [and let thy seed possess the gates of their enemies]”. May it be God’s will that that seed may proceed from you and not from another woman”.